2, 4-bis-haloalkyl-6-alkoxy-1, 3, 5-triazines and their preparation



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United States Patent 2,4-BIS-HALOALKYL-6-ALKOXY-1,3,5-TRIAZINES AND THEIR PREPARATION Hansjuergen A. Schroeder and Christoph J. Grundmann, Columbus, Ohio, assignors to Olin Mathieson Chemical Corporation, a corporation of Virginia No Drawing. Filed Aug. 15, 1957, Ser. No. 678,448 10 Claims. (Cl. 260-248) This invention relates to certain novel 2,4-bis-haloalkyl- 6-alkoxy-1,3,5 triazines and the method for their preparation.

It is known that 2,4,6-trichloro-s-triazine (cyanuric chloride) reacts with alcohols exclusively with formation of the corresponding alkylchloride and' cyanuric acid. With ethanol, for example, the reaction proceeds in the following manner:

Alkoxy-s-triazines cannot be obtained by this reaction.

where X is a halogen, R is a haloalkyl group, e.g. chloromethyl, dichloromethyl, tn'chloromethyl, bromomethyl, tribromomethyl, 1,1 dichloroethyl, pentafluoroethyl, heptafluoropropyl and the like wherein the alkyl substituent contains up to 12 carbon atoms, and R is a primary or secondary alkyl group with one to eight carbon atoms, for example, methyl, ethyl, isopropyl, n-propyl, n-butyl, isoamyl, n-hexyl or n-octyl. The useful halogens include fluorine, bromine, chlorine and iodine. The new compounds are 2,4-bis-haloalkyl-6-alkoxy-1,3,5-triazines of the Formula II above.

The reaction of the compounds of Formula I and the alcohol is carried out by admixing the reactants. Preferably, the 2,4-bis-l1aloalkyl-6-halo-s-triazine is mixed with an excess of the alcohol and the mixture is heated until the calculated amount of hydrogen halide is liberated. This point can easily be determined by taking an aliquot part of the reaction mixture and titrating the liberated hydrogen halide by a conventional method. The preferred reaction temperatures lie between about 50 and about 100 C. The required reaction time may vary according to the alcohol used between a few minutes and Patented Aug. 30, 1960 be obtained by evaporating the excess of alcohol and the formed hydrogen halide. The yields are in general good to excellent. If necessary, the remaining crude product can be purified by crystallization from a suitable solvent, or, if liquid, by vacuum distillation.

The novel compounds thus prepared, the 2,4-bis-haloalkyl-6-alkoxy-s-triazines, are useful as agriculturals as they possess besides insecticidal and fungicidal properties a pronounced herbicidal activity. Especially valuable in this respect is the 2,4-bis-ttichloromethyl-6-ethoxy-1,3,5- triazine which is an excellent pro-emergence herbicide. At proper dosage it is highly selective, i.e., it destroys the noxious weeds While valuable crops are not attacked at all.

The starting compounds 2,4-bis-haloalkyl-6-h-alo-1,3,5- triazines of Formula I can be prepared by reacting phosphorus oxyhalides, preferably phosphorus oxychloride or phosphorus oxybromide, with the double salts of 2,4-bishaloalkyl-6-hydroxy-1,3,5 triazine with amidines as described or in pending application Serial No. 529,928, filed August 22, 1955, of Schroeder and Grundmann. The amidine salts are described in pending application, Serial No. 529,927, filed August 22, 1955, of Schroeder and Grundmann. The amidine salts have the formula:

5 wherein R is a haloalkyl radical. These salts are pre about 100 to 200 C.

. tillation and the halotriazine is recovered by crystallization. 'I-t-is suitably purified by recrystallization.

The novel compounds of this inventionand their preparation will be further illustrated by the following examples.

EXAMPLE I 2,4-bis-trichloromethyI-6-eth0xy-s-triazine A solution of 25 grams of 2,4-bis-t1ichloromethyl- G-chloro-s-triazine in 130 milliliters of absolute ethanol is kept at C. for 40 minutes. After distilling off the several hours. The desired reaction product can easily alcohol and the formed hydrogen chloride the remainder is dissolved in Skellysolve F, filtered from insoluble byproducts, and the filtrate evaporated. The oily residue is purified by vacuum distillation, B.P. C. at 0.1 mm.

pressure, n 1.5332. Yield: 24 grams, corresponding to 94% of the theory.

Calcd. for C H Cl N O: C, 23.36; H, 1.40; N, 11.95; Cl, 59.12. Found: C, 23.53, 23.21; H, 1.46, 1.35; N, 11.90, 11.79; Cl, 59.03, 59.28; v

EXAMPLE I]: V

,2,4-bis-trichloromethyl-6-methoxy-s-triaafne- I A solution of 5 grams of 2,4-bis-trichlorometliyl-6i.

chloro-s-triazine in 40'milliliters of methanol was er fluxed for 40 minutes. Then the excess-methanol an the hydrogen chloride formed was evaporated i.v. at

p Ce 2,951,079

, 3 Recrystallization from Skellysolve F gave 3.8 grams (77% of the theory), M.P. 46 C.

Calcd. for C H Cl N O: C, 20.84; H, 0.87;N, 12.15; Cl, 61.51. Found: C, 20.77, 20.67; H, 0.89, 0.84; N, 12.33, 12.53;--Cl, 61.93, 62.23.

EXAMPLE III 2,4-bis-1rz'chloromezhyl 6-isopropoxy-s-ifiazine .A solution of 4.3 grams of 2,4-bis-trichloromethyl-6- chloro-s-triazine in 30 milliliters of isopropanol was kept at 60 C. for 30 minutes. After evaporation of the excess-alcohol and the HCl formed, 30 milliliters of Skellysolve F was added. The solution was filtered after five hours and the solvent was evaporated. The residual 2,4-

bis-trichlyoromethyl 6-isopropoxy-s-triazine was purified by vacuum distillation; B.P. 1 min: 157 C., yield: 3.7 grams (80% of the'theory).

Calcd. for C H Cl N O: C, 25.70; N, 1.89; N, 11.24; Cl, 56.90. Found: C, 24.61, 24.45; N, 1.90, 2.11;N, 11.57, 11.73; Cl, 57.14, 57.39.

EXAMPLE IV 2,4-bis-pentafluoroethyl-o-ethoxy-s-triazine A solution of 6 gnams of 2,4-bis-pentafluoroethyl-6- chloro=s-.tri=azine in 40 milliliters of absolute ethanol was kept at 50 C. for 30 minutes. Then the excess-ethanol and the HCl formed was evaporated, the reaction product was purified by dissolving it in Sk-ellysolve F and filtration, followed by evaporation of the solvent. The oily residue was distilled i.v., B1. 150 mm: 122 C., n 1.3588. Yield: 4.4 grams (71% of the theory).

Calcd. for C H F N O: C, 29.93; H, 1.40; N, 11.64. Found: C, 30.52, 30.28; H, 1.95, 2.01; N, 11.63, 11.84.

EXAMPLE V 2,4-bis-trichloromethyl-6-ethoxy-s-triazine was tested as a pre-emergence herbicide at 16 lb./ acre. For comparison the commercial herbicide 3-(p-chlorophenyl)-1,1*- dimethy'l urea (CMU) was tested simultaneously at 4 lb./acre.

PERCENT ACTIVITY Chemical Rye Mus Pig- Cot Soy- Corn Wheat grass tard weed ton. bean 2, l-bistriehloromethyl- I fi ethoxy-s-triazinm 80 80 90 0 0 0 0 3-p-chlor0phenyl- 1,1

di-methyl urea (CMU) 90 00 90 40 40 50 70 Component Percent by weight Productof Example I 40 Barden Clay" 50 "Igepon T-73" 5 Marasperse N, a highly purified lign0sul!onate 5 'I his test was cameo out in the manner described Shaw and C. R. Swanson, in Weeds, 1, 352-65 (1952). The chemical to be tested. in this case, 2,4.

4 bis-trichloromethyl-6-ethoxy-s-triazine, was applied to metal flats in which were seeded crop and Weed species. The flats were prepared by putting 8 quarts of soil into each and planting lengthwise one row of each of four crops. The crops used were corn (15 seeds), cotton (30 seeds), soybeans (15 seeds) and wheat (3 cc). These were covered with two quarts of soil and a mixture of weed seeds was scattered evenly over this soil. This mixture contained mustard (Brassica kaber) 3 cc., pigweed (Amaranthus retroflexus) 1 cc., and ryegrass (Lolium mu'ltiflorum) 4 cc. These seeds were covered with two quarts of soil and the result was a flat with crops planted at 'a depth of 1 /2 inch and the weeds planted at a depth of about A inch.

The chemicals to be tested were applied by spraying to the flats as an acetone solution.

The 2,4-bis-trichloromethyl6-ethoxy-s-triazine was applied to the flats in acetone solution as a spray at a rate of 16 lb./acre while the control chemical, 3-(p-chlorophenyl)-1,1-dimethyl urea (CMU, a commercial herbicide) was applied at the rate of 4 lb./acre both by a machine especially designed for testing purposes. In addition to the control herbicide, check flats which were not treated were also prepared and sent to the greenhouse along with the treated flats.

The plants were allowed to grow in a greenhouse for about ten days during which time factors such as temperature, soil moisture and light were kept as constant as was feasible. Then a visual estimate of the amount of injury to each of the weed and crop species was made. This estimate was recorded for each species on a scale of 0-10, 0 indicating no injury and 10 indicating complete killing. Next measurements of plant heights of the four cropvspecies were made and height reductions as percent of the height of control plants were calculated. Third, stand counts were made of the corn, soybeans and cotton. Stand reductions were calculated as percent of the stand in control flats; the percent stand reduction for wheat and the three weed species was estimated. After converting to 0-10 injury ratings to a percentage basis, the average of the injury rating height reductions and stand reduction for each crop and for eachweed was made. The resulting value is the percent herbicide activity of the chemical for a single species as shown in the table of Example V which can be used to compare the eifectiveness of various chemicals against the crop and weed species.

What is claimed is:

1. 2,4-bis-haloalkyl-6-alko)iy-1,3,5-triazines of the formula wherein R is a haloalkyl radical containing from 1 to 12 carbon atoms and R is an alkyl radical containing from 1 to 8 carbon atoms.

2. 2 ,4-bis-trichloromethyl-6 ethoxy-1,3,5-triazine.

3.- 2,4-bis-trichloromethyl-6-methoXy-1,3,5-triazine.

4. 2,4 bis-trichloromethyl-6-isopropoxy-1,3,S-triazine.

'5. 2,4-bis-pentafluoroethyl-6-ethoxy-1,3,S triazine.

6. The method of preparing 2,4-bis-haloalkyl-6-alkoxy 1,3,5-t'riazines,of the formula wherein Ris ahaloalkyl radical and R is an alkyl radical,

which comprises reacting a 2,4-bis#haloalkyl-G-halo-1,3,5- triazine of the formula wherein R is a haloalkyl radical containing from 1 to 12 carbon atoms and X is a halogen, with an alcohol selected from the group consisting of primary and secondary a1- cohols of the formula R'OH wherein R is an alkyl radical containing from 1 to 8 carbon atoms, at a temperature of about 50 to about 7. The method of preparing 2,4-bis-trichloromethyl-6- 6 ethoxy-1,3,5-triazine which comprises reacting 2,4-bistrichloromethyl-6-chloro-1,3,5-triazine with ethanol at a temperature of about to about C.

8. The method of preparing 2,4-bis-trichloromethyl-6- methoxy-1,3,5-t1iazine which comprises reacting 2,4-bistrichloromethyl-6-chloro-1,3,5-triazine with methanol at a temperature of about 50 to about 100 C.

9. The method of preparing 2,4-bis-trichloromethyl-6- isopropoxy-1,3,5-triazine which comprises reacting 2,4-bistrichloromethyl-6-chloro-1,3,5-triazine with isopropanol at a temperature of about 50 to about 100 C.

10. The method of preparing 2,4-bis-pentafluoroethy1- 6-ethoxy-l,3,5-triazine which comprises reacting 2,4-bispentafluoroethyl-6-chloro-1,3,5-triazine with ethanol at a temperature of about 50 to about 100 C.

References Cited in the file of this patent Dudley et al.: Journal of the American Chemical Society, vol. 73, pp. 2986-2990 (1951). 

1. 2,4-BIS-HALOALKYL-6-ALKOXY-1,3,5-TRIAZINES OF THE FORMULA 